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医学
Sleep is divided into periods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of n
Sleep is divided into periods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of n
admin
2018-05-06
19
问题
Sleep is divided into periods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of non-REM sleep.【C1】______ kind of sleep is at all well-understood, but REM sleep is【C2】______ to serve some restorative function of the brain. The purpose of non-REM sleep is even more【C3】______ . The new experiments, such as those【C4】______ for the first time at a recent meeting of the Society for Sleep Research in Minneapolis, suggest fascinating explanations【C5】______ of non-REM sleep.
For example, it has long been known that total sleep【C6】______ is 100 percent fatal to rats, yet,【C7】______ examination of the dead bodies, the animals look completely normal. A researcher has now【C8】______ the mystery of why the animals die. The rats【C9】______ bacterial infections of the blood,【C10】______ their immune systems—the self-protecting mechanism against disease—had crashed.
【C4】
选项
A、maintained
B、described
C、settled
D、afforded
答案
B
解析
本题考查动词词义辨析。根据上下文推断,此句说是在大会上,新的研究应该是被介绍给参会人。maintain意为“主张”;describe意为“描述”;settle意为“解决”;afford“提供,付得起”。故选B。
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